chore: scaffold Nuxt 4 app with Postgres, tooling and health route

Nuxt 4 (app/ structure) + TypeScript, ESLint, Vitest + @nuxt/test-utils,
Drizzle + pg, a /api/health route with a DB ping, and a dev docker-compose
(app + Postgres). Verified: pnpm test, lint, and build pass; the built
server answers /api/health.

drizzle.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from 'drizzle-kit'
+
+export default defineConfig({
+  dialect: 'postgresql',
+  schema: './server/db/schema.ts',
+  out: './server/db/migrations',
+  dbCredentials: {
+    url: process.env.DATABASE_URL ?? '',
+  },
+})